TITLE: Does it make sense to learn any other language except English, being a mathematician?
QUESTION [8 upvotes]: Would it be an advantage for a committed modern day research mathematicians to learn any foreign language? Are there works in Russian, French, or any other foreign language being produced or that have not been translated?

REPLY [2 votes]: Would it be an advantage for a committed modern day research
  mathematicians to learn any foreign language?

Knowing other languages and cultures (other than your native one) can make one a more interesting person which will certainly help during the job search phase and in general academic life.